Ni de Shenti Zai Shuohuang

An Inspector General of the Special Division has spent years chasing the serial killer known as Zero, a pursuit that has hardened into an obsession. What she never suspected is that Jiang Tan, the gifted physician who is constantly at Xia Zhi's side and holds her full trust, is in fact Zero's hidden identity. With her lover revealed as two faced, both angelic and devilish, she is caught between his contradictory selves. As the brilliant doctor, he claims he must draw a deep sample of her bodily fluids to steady her mind and regulate her hormones, insisting she should have no reason to doubt a doctor. As the killer, he taunts her over the hormones she is releasing, suggesting it is because he brings her pleasure.